1 /*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkBitmap.h"
9 #include "SkCanvas.h"
10 #include "SkData.h"
11 #include "SkDiscardableMemoryPool.h"
12 #include "SkImageGenerator.h"
13 #include "SkMatrixUtils.h"
14 #include "SkPaint.h"
15 #include "SkPath.h"
16 #include "SkPixelRef.h"
17 #include "SkRandom.h"
18 #include "SkShader.h"
19 #include "SkSurface.h"
20 #include "Test.h"
21
22 class FailurePixelRef : public SkPixelRef {
23 public:
FailurePixelRef(const SkImageInfo & info)24 FailurePixelRef(const SkImageInfo& info) : SkPixelRef(info) {}
25 protected:
onNewLockPixels(LockRec *)26 bool onNewLockPixels(LockRec*) override { return false; }
onUnlockPixels()27 void onUnlockPixels() override {}
28 };
29
30 // crbug.com/295895
31 // Crashing in skia when a pixelref fails in lockPixels
32 //
test_faulty_pixelref(skiatest::Reporter * reporter)33 static void test_faulty_pixelref(skiatest::Reporter* reporter) {
34 // need a cache, but don't expect to use it, so the budget is not critical
35 sk_sp<SkDiscardableMemoryPool> pool(
36 SkDiscardableMemoryPool::Create(10 * 1000, nullptr));
37
38 SkBitmap bm;
39 const SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
40 bm.setInfo(info);
41 bm.setPixelRef(sk_make_sp<FailurePixelRef>(info), 0, 0);
42 // now our bitmap has a pixelref, but we know it will fail to lock
43
44 auto surface(SkSurface::MakeRasterN32Premul(200, 200));
45 SkCanvas* canvas = surface->getCanvas();
46
47 const SkFilterQuality levels[] = {
48 kNone_SkFilterQuality,
49 kLow_SkFilterQuality,
50 kMedium_SkFilterQuality,
51 kHigh_SkFilterQuality,
52 };
53
54 SkPaint paint;
55 canvas->scale(2, 2); // need a scale, otherwise we may ignore filtering
56 for (size_t i = 0; i < SK_ARRAY_COUNT(levels); ++i) {
57 paint.setFilterQuality(levels[i]);
58 canvas->drawBitmap(bm, 0, 0, &paint);
59 }
60 }
61
62 ///////////////////////////////////////////////////////////////////////////////
63
rand_matrix(SkMatrix * mat,SkRandom & rand,unsigned mask)64 static void rand_matrix(SkMatrix* mat, SkRandom& rand, unsigned mask) {
65 mat->setIdentity();
66 if (mask & SkMatrix::kTranslate_Mask) {
67 mat->postTranslate(rand.nextSScalar1(), rand.nextSScalar1());
68 }
69 if (mask & SkMatrix::kScale_Mask) {
70 mat->postScale(rand.nextSScalar1(), rand.nextSScalar1());
71 }
72 if (mask & SkMatrix::kAffine_Mask) {
73 mat->postRotate(rand.nextSScalar1() * 360);
74 }
75 if (mask & SkMatrix::kPerspective_Mask) {
76 mat->setPerspX(rand.nextSScalar1());
77 mat->setPerspY(rand.nextSScalar1());
78 }
79 }
80
rand_size(SkISize * size,SkRandom & rand)81 static void rand_size(SkISize* size, SkRandom& rand) {
82 size->set(rand.nextU() & 0xFFFF, rand.nextU() & 0xFFFF);
83 }
84
test_treatAsSprite(skiatest::Reporter * reporter)85 static void test_treatAsSprite(skiatest::Reporter* reporter) {
86
87 SkMatrix mat;
88 SkISize size;
89 SkRandom rand;
90
91 SkPaint noaaPaint;
92 SkPaint aaPaint;
93 aaPaint.setAntiAlias(true);
94
95 // assert: translate-only no-aa can always be treated as sprite
96 for (int i = 0; i < 1000; ++i) {
97 rand_matrix(&mat, rand, SkMatrix::kTranslate_Mask);
98 for (int j = 0; j < 1000; ++j) {
99 rand_size(&size, rand);
100 REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, noaaPaint));
101 }
102 }
103
104 // assert: rotate/perspect is never treated as sprite
105 for (int i = 0; i < 1000; ++i) {
106 rand_matrix(&mat, rand, SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask);
107 for (int j = 0; j < 1000; ++j) {
108 rand_size(&size, rand);
109 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, noaaPaint));
110 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, aaPaint));
111 }
112 }
113
114 size.set(500, 600);
115
116 const SkScalar tooMuchSubpixel = 100.1f;
117 mat.setTranslate(tooMuchSubpixel, 0);
118 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, aaPaint));
119 mat.setTranslate(0, tooMuchSubpixel);
120 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, aaPaint));
121
122 const SkScalar tinySubPixel = 100.02f;
123 mat.setTranslate(tinySubPixel, 0);
124 REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, aaPaint));
125 mat.setTranslate(0, tinySubPixel);
126 REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, aaPaint));
127
128 const SkScalar twoThirds = SK_Scalar1 * 2 / 3;
129 const SkScalar bigScale = (size.width() + twoThirds) / size.width();
130 mat.setScale(bigScale, bigScale);
131 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, noaaPaint));
132 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, aaPaint));
133
134 const SkScalar oneThird = SK_Scalar1 / 3;
135 const SkScalar smallScale = (size.width() + oneThird) / size.width();
136 mat.setScale(smallScale, smallScale);
137 REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, noaaPaint));
138 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, aaPaint));
139
140 const SkScalar oneFortyth = SK_Scalar1 / 40;
141 const SkScalar tinyScale = (size.width() + oneFortyth) / size.width();
142 mat.setScale(tinyScale, tinyScale);
143 REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, noaaPaint));
144 REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, aaPaint));
145 }
146
assert_ifDrawnTo(skiatest::Reporter * reporter,const SkBitmap & bm,bool shouldBeDrawn)147 static void assert_ifDrawnTo(skiatest::Reporter* reporter,
148 const SkBitmap& bm, bool shouldBeDrawn) {
149 for (int y = 0; y < bm.height(); ++y) {
150 for (int x = 0; x < bm.width(); ++x) {
151 if (shouldBeDrawn) {
152 if (SK_ColorTRANSPARENT == *bm.getAddr32(x, y)) {
153 REPORTER_ASSERT(reporter, false);
154 return;
155 }
156 } else {
157 // should not be drawn
158 if (SK_ColorTRANSPARENT != *bm.getAddr32(x, y)) {
159 REPORTER_ASSERT(reporter, false);
160 return;
161 }
162 }
163 }
164 }
165 }
166
test_wacky_bitmapshader(skiatest::Reporter * reporter,int width,int height,bool shouldBeDrawn)167 static void test_wacky_bitmapshader(skiatest::Reporter* reporter,
168 int width, int height, bool shouldBeDrawn) {
169 SkBitmap dev;
170 dev.allocN32Pixels(0x56F, 0x4f6);
171 dev.eraseColor(SK_ColorTRANSPARENT); // necessary, so we know if we draw to it
172
173 SkMatrix matrix;
174
175 SkCanvas c(dev);
176 matrix.setAll(-119.34097f,
177 -43.436558f,
178 93489.945f,
179 43.436558f,
180 -119.34097f,
181 123.98426f,
182 0, 0, SK_Scalar1);
183 c.concat(matrix);
184
185 SkBitmap bm;
186 if (bm.tryAllocN32Pixels(width, height)) {
187 // allow this to fail silently, to test the code downstream
188 }
189 bm.eraseColor(SK_ColorRED);
190
191 matrix.setAll(0.0078740157f,
192 0,
193 SkIntToScalar(249),
194 0,
195 0.0078740157f,
196 SkIntToScalar(239),
197 0, 0, SK_Scalar1);
198 SkPaint paint;
199 paint.setShader(SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode,
200 SkShader::kRepeat_TileMode, &matrix));
201
202 SkRect r = SkRect::MakeXYWH(681, 239, 695, 253);
203 c.drawRect(r, paint);
204
205 assert_ifDrawnTo(reporter, dev, shouldBeDrawn);
206 }
207
208 /*
209 * Original bug was asserting that the matrix-proc had generated a (Y) value
210 * that was out of range. This led (in the release build) to the sampler-proc
211 * reading memory out-of-bounds of the original bitmap.
212 *
213 * We were numerically overflowing our 16bit coordinates that we communicate
214 * between these two procs. The fixes was in two parts:
215 *
216 * 1. Just don't draw bitmaps larger than 64K-1 in width or height, since we
217 * can't represent those coordinates in our transport format (yet).
218 * 2. Perform an unsigned shift during the calculation, so we don't get
219 * sign-extension bleed when packing the two values (X,Y) into our 32bit
220 * slot.
221 *
222 * This tests exercises the original setup, plus 3 more to ensure that we can,
223 * in fact, handle bitmaps at 64K-1 (assuming we don't exceed the total
224 * memory allocation limit).
225 */
test_giantrepeat_crbug118018(skiatest::Reporter * reporter)226 static void test_giantrepeat_crbug118018(skiatest::Reporter* reporter) {
227 static const struct {
228 int fWidth;
229 int fHeight;
230 bool fExpectedToDraw;
231 } gTests[] = {
232 { 0x1b294, 0x7f, false }, // crbug 118018 (width exceeds 64K)
233 { 0xFFFF, 0x7f, true }, // should draw, test max width
234 { 0x7f, 0xFFFF, true }, // should draw, test max height
235 { 0xFFFF, 0xFFFF, false }, // allocation fails (too much RAM)
236 };
237
238 for (size_t i = 0; i < SK_ARRAY_COUNT(gTests); ++i) {
239 test_wacky_bitmapshader(reporter,
240 gTests[i].fWidth, gTests[i].fHeight,
241 gTests[i].fExpectedToDraw);
242 }
243 }
244
245 ///////////////////////////////////////////////////////////////////////////////
246
test_nan_antihair()247 static void test_nan_antihair() {
248 SkBitmap bm;
249 bm.allocN32Pixels(20, 20);
250
251 SkCanvas canvas(bm);
252
253 SkPath path;
254 path.moveTo(0, 0);
255 path.lineTo(10, SK_ScalarNaN);
256
257 SkPaint paint;
258 paint.setAntiAlias(true);
259 paint.setStyle(SkPaint::kStroke_Style);
260
261 // before our fix to SkScan_Antihair.cpp to check for integral NaN (0x800...)
262 // this would trigger an assert/crash.
263 //
264 // see rev. 3558
265 canvas.drawPath(path, paint);
266 }
267
check_for_all_zeros(const SkBitmap & bm)268 static bool check_for_all_zeros(const SkBitmap& bm) {
269 SkAutoLockPixels alp(bm);
270
271 size_t count = bm.width() * bm.bytesPerPixel();
272 for (int y = 0; y < bm.height(); y++) {
273 const uint8_t* ptr = reinterpret_cast<const uint8_t*>(bm.getAddr(0, y));
274 for (size_t i = 0; i < count; i++) {
275 if (ptr[i]) {
276 return false;
277 }
278 }
279 }
280 return true;
281 }
282
283 static const int gWidth = 256;
284 static const int gHeight = 256;
285
create(SkBitmap * bm,SkColor color)286 static void create(SkBitmap* bm, SkColor color) {
287 bm->allocN32Pixels(gWidth, gHeight);
288 bm->eraseColor(color);
289 }
290
DEF_TEST(DrawBitmapRect,reporter)291 DEF_TEST(DrawBitmapRect, reporter) {
292 SkBitmap src, dst;
293
294 create(&src, 0xFFFFFFFF);
295 create(&dst, 0);
296
297 SkCanvas canvas(dst);
298
299 SkIRect srcR = { gWidth, 0, gWidth + 16, 16 };
300 SkRect dstR = { 0, 0, SkIntToScalar(16), SkIntToScalar(16) };
301
302 canvas.drawBitmapRect(src, srcR, dstR, nullptr);
303
304 // ensure that we draw nothing if srcR does not intersect the bitmap
305 REPORTER_ASSERT(reporter, check_for_all_zeros(dst));
306
307 test_nan_antihair();
308 test_giantrepeat_crbug118018(reporter);
309
310 test_treatAsSprite(reporter);
311 test_faulty_pixelref(reporter);
312 }
313